A vessel with moonpool capable of being used offshore comprising a monohull with moonpool; a multipurpose tower mounted on the vessel; an equipment handling system removably mounted on the vessel; a movable hatch installed on top of the moonpool; and a hoist system installed inside the vessel, as well as an improved multipurpose tower, a moveable hatch and modular features for the tower. The invention is also a moveable hatch and a multipurpose tower.
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1. A movable hatch comprising:
a. a main structure;
b. a set of movable fenders mounted in the main structure adapted to absorb shock;
c. a set of hatches mounted on the top of the main structure; and
d. a hatch moving system mounted on the side of the main structure connected to the set of hatches.
9. A multipurpose tower comprising:
a. a mast comprising a mast top side, a mast bottom side, a mast forward side, and a mast back side;
b. a plurality of cable blocks connected to the mast top side;
c. a main trolley comprising a firs gripper moveably connected to the mast forward side;
d. an auxiliary trolley comprising a second gripper moveably connected to the mast forward side;
e. at least one main hoist connected to the mast;
f. at least one secondary hoist connected to the mast and the auxiliary trolley adapted to move the auxiliary trolley relative to the mast; and
g. a hoisting cable connected to the at least one main hoist adapted to be guided over the plurality of cable blocks and adapted to move the main trolley relative to the mast.
3. The movable hatch of
4. The movable hatch of
6. The movable hatch of
7. The movable hatch of
8. The moveable hatch of
a. a second main structure;
b. a second set of movable fenders mounted in the second main structure adapted to absorb shock;
c. a second set of hatches mounted on the top of the second main structure;
d. a second hatch moving system mounted on the side of the second main structure connected to the second set of hatches; and
wherein the second main structure is located opposite to the first main structure.
11. The multipurpose tower of
13. The multipurpose tower of
14. The multipurpose tower of
15. The multipurpose tower of
17. The multipurpose tower of
18. The multipurpose tower of
19. The multipurpose tower of
20. The multipurpose tower of
21. The multipurpose tower of
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The present invention is a conversion of and claims priority from co-pending provisional patent application No. 60/407,424, filed on Aug. 30, 2002.
The invention relates to a vessel for use in the offshore industry on which a multipurpose tower and a module handling system are mounted.
The module handling system includes a module moving system that can move heavy equipment and sub sea modules over the deck of the vessel. The system also has a moonpool hatch that can stabilize modules when those are lowered or hoisted through the moonpool. The moonpool hatch can serve as a working platform and as a support for the module moving system.
The multipurpose tower is fitted with a main and auxiliary trolley, hoists, and cable, as well as accommodations for an elevating working platform.
Today a significant percentage of the production equipment is not installed on the surface of the sea, but on the sea bottom. As with all equipment, the equipment on the sea bottom needs regular maintenance. Specifically, during the lifetime of an oilfield, the bore holes and the oilfield itself need maintenance to keep the production as high as possible.
Maintenance of the oil field and the production equipment on the sea bottom is a difficult task that is both time intensive and very expensive.
To perform this maintenance, special vessels are typically needed. Some of the special vessels are known as semi-submersibles and drill ships. These ships have a number of disadvantages. The main disadvantages are their low transit speeds and high daily running cost.
New builds or converted non-dedicated ships, so-called “well intervention vessels”, are increasingly being used to install equipment on the sea bottom and to perform maintenance. The main advantages of small ships are low running cost and acceptable transit speeds. The disadvantage is that these small ships tend to have bad motion characteristics. The small ships move a lot more compared to the bigger units thereby limiting their use to only “good weather windows”.
Well intervention involves everything from lowering a ROV to do a visual check to lowering entire production or maintenance units to the sea bottom and retrieving the units. During the intervention operation, units have to be moved over the deck of the vessel from and to storage areas, the moonpool, and maintenance areas. Often these units are big and heavy and handling them are difficult and dangerous tasks. Sometimes these modules are required to be stacked on top of each other prior to lowering them to the seabed. Often crewmembers have to work on elevated levels to be able to reach all parts of the units. Current practice is the use of man-riding winches. Again, this is both dangerous and time consuming. Many accidents have occurred with the use of man riding winches.
Moving heavy objects also requires the use of cranes. Moving and lifting modules on a moving deck can be quite dangerous and numerous accidents have occurred during this kind of activities.
Apart from moving objects on the decks, lowering and lifting of the units through moonpools located in the vessel creates some specific problems. When lowering units through the moonpool, the objects tend to swing form side to side. Considerable risk of damage to the unit or the vessel arises when the modules are not constrained in some way.
Retrieving objects through the moonpool is equally dangerous. The relative motion of the vessel and the modules can be such that there is also the danger of the module hitting the vessel and thereby endangering the vessel and the lives for the crew.
According to prior art, standard drilling derricks are used in well intervention. The standard drilling derricks have an inverted U shape to lower to and lift objects of the seabed. This shape severely limits the size of the modules that can be handled since every module has to pass through the V-door of the drilling derrick. The two vertical support structures on most standard vessels severely limit the area that can be reached by other cranes and equipment of the vessel.
Due to the construction of the drilling derricks, the drilling derricks must be placed at specific locations in order not to hinder other equipment. This restriction limits the freedom in the design of the vessel considerably. Also, removing the drilling derrick from the vessel when it is not used is a difficult task due to the size and the weight of the drilling derrick.
A need, therefore exists for a module handling system for a well intervention vessel that can be removable mounted on a vessel; has a large freedom of placement on the vessel; does not claim a large working space; can safely move heavy and large objects around the deck; can lower and retrieve modules from the seabed through the moonpool; allows work on the modules on elevated levels safely; and allows modules to be placed on the seabed accurately.
The object of the current invention is to address the problems in the prior art and provide a tower for a monohull with a substantially hollow mast and at least one hoisting device.
The invention is a monohull vessel with moonpool capable of being used offshore. The monohull vessel has moonpool, equipment handling system removably mounted on the vessel and a movable hatch installed on top of the moonpool. The monohull vessel also includes a hoist system installed inside the vessel as well as a multipurpose tower mounted on the vessel.
The invention is a moveable hatch having a main structure and a set of movable fenders mounted in the main structure adapted to absorb shock. The movable hatch also has a set of hatches mounted on the top of the main structure and a hatch moving system mounted on the side of the main structure connected to the set of hatches.
The invention is a multipurpose tower with a mast comprising a mast top side, a mast bottom side, a mast forward side, and a mast back side. The tower has a plurality of cable blocks connected to the mast top side. The tower also has a main trolley with a first gripper and an auxiliary trolley with a second gripper moveably connected to the mast forward side. The tower next has at least one main hoist connected to the mast and at least one secondary hoist connected to the mast and the auxiliary trolley adapted to move the auxiliary trolley relative to the mast. Finally, the tower has a hoisting cable connected to the at least one main hoist adapted to be guided over the plurality of cable blocks and adapted to move the main trolley relative to the mast.
The present invention will be explained in greater detail with reference to the appended Figures, in which:
The present invention is detailed below with reference to the listed Figures.
Before explaining the present invention in detail, it is to be understood that the invention is not limited to the particular embodiments herein and it can be practiced or carried out in various ways.
The object of the invention is to provide a module handling package wherein the above-mentioned drawbacks are avoided at least to a considerable extent.
Now and with reference to the Figures,
The multipurpose tower (1) is located next to moonpool (9). The first trolley guiding rail (13) and second trolley guiding rail (14) are connected to the front of multipurpose tower (1) and run into moonpool (9) to the bottom (8) of the vessel (7). In this embodiment, the main trolley (29) and auxiliary trolley (27) can move from the top side (113) of the multipurpose tower (1) to the bottom (8) of the vessel (7). The main trolley (29) and auxiliary trolley (27) can be connected to module (5) while module (5) is lowered into moonpool (9). This connection prevents any free movement of module (5) while the module (5) is being hoisted of lowered into of from moonpool (9).
When the module (5) reaches bottom (8) of vessel (7), both trolleys disconnect. Since the module is now under water level (123), the motions of module (5) are considerably reduced thereby reducing the risk of module (5) hitting first side wall (125) or second side wall (126) of the moonpool. The module (5) has to be lowered only a small distance in order for the module (5) to clear from vessel (7) completely.
Continuing with
The first hatch (23) and second hatch (21) are visible in FIG. 2. The first hatch (23) and second hatch (21) can move over deck (10) in directions indicated with A and B respectively. The movement of first hatch (23) and second hatch (21) respectively is always perpendicular to second multi purpose centerline (133) of multipurpose tower (1). This movement is needed because otherwise the hatches would collide with the multipurpose tower.
Also in
The skid cart (111), not visible in
Working on well intervention vessels is dangerous and demanding since the deck of the vessel is moving considerably in all directions. Bad weather and unfavourable wind and water conditions can increase the difficulty of the work. In addition, any motion of the well intervention vessel is amplified when working at elevated heights. On most vessels, crew members that have to work on elevated levels are being hoisted by so called “man riding winches”. The use of man-riding winches no matter how reliable they are has caused a large number of accidents often with deadly consequences.
The size of working platform (31) is such that it can pass the main trolley (29) and auxiliary trolley (27) without interference. The working platform (31) can pass the module (5), which is not shown in this
Often different modules have different sizes. In order to allow the crew to work on the modules in a safe and efficient matter, the movable plates (43 and 44) are adapted to move in order to minimize the gap between the modules and working platform (31). By minimizing this gap, crew members and tools are less likely to fall. An additional precaution to protect the crew working platform (31) can include fitting the elevating working platform (31) with a railing (151). In another embodiment, the elevating working platform (31) can be fitted with a wind wall or other protection devices.
The auxiliary trolley (27) can also used to stabilize the module (5) when the module (5) is being hoisted or lowered. In this case, the moving arms move outward until a connection can be made with the module (5). The auxiliary trolley (27) moves on the inside of first and second trolley guiding rails (13 and 14) mounted on front side multipurpose tower (1). The auxiliary trolley (27) is guided ion the rails (13 and 14) by first and second wheel sets (50 and 51) which are fixably connected to auxiliary trolley main structure (49).
Continuing with
The stabilization is partly done by using the auxiliary hoist (27) by controlling the hydraulic cylinder (45) to act as a damper until movement of module (5) is decreased such that a fixed connection between moving arms (47 and 48) and the module (5) can be made. After the connection is complete, the moving arms (47 and 48) extend or retract to align the module (5) to multipurpose tower (1). Large forces can occur during the damping phase and the auxiliary trolley (27) has a relative heavy construction to cope with these forces.
The ball weight (161) is used in hoisting the main trolley. The ball weight (161) is located at the end of the main hoist wire (59). The main hoist wire (59) connects to a catching cone (163) fixably mounted on main trolley (29). While the load is lowered into the moonpool, the main trolley (29) moves to bottom (8) of the vessel where it disconnects from the ball weight (161) while the load is lowered further. The shape of the ball weight (161) is such that the ball centers when it enters the catching cone (163) of the main hoist (29). This method ensures that no locking devices are necessary in this embodiment although operational demands could make additional locking of the ball weight (161) and catching cone (163) necessary.
Multiple winches are located inside multipurpose tower (1). As seen in
The winches (167, 168, 169, 170 and 171) are used to hoist auxiliary trolley (27), working platform (31), and a plurality of wires. Of the plurality of wires,
The wires (175, 177 and 179) run from the third winch (169), the fourth winch (170), and the fifth winch (171) to the first compensation system (181), the second compensation system (183), and the third compensation system (187), respectively. The wires are run over a multitude of sheaves located in masthead (191).
Between the winches (167, 168, 169, 170 and 171) and the module (5), heave compensation systems can be installed.
As seen in
The main hoist wire (59) runs from the inside of the vessel (7) to the inside (193) of multipurpose tower (1), over the first sheave (195), and the over the second sheave (196). The first sheave (195) is fixably connected to masthead (191) while the second sheave (196) is rotably fixed to masthead (191).
A ladder (199) is connected to the masthead (191) to make it possible for the crew to move from the elevating working platform (31) onto the masthead (191) in a safe and orderly manner. This ladder is advantageous because large pieces of equipment can now be transported to the masthead without the restrictions of the limited space and the crew does not need to climb a large number of stairs or ladders to reach the masthead (191). Also seen in
Also visible in
The hydraulic cylinders can be controlled to act as shock dampers. When the module (5) is hoisted into the moonpool (9) the movements of the module have to be minimized in order to prevent damage to the moonpool. This minimizing of movements is done by moving the second hatch (21) and the first hatch (23) simultaneously to the center of moonpool (9) with the fenders fully extended and damping out any excess movement of module (5).
The fender (222) includes a shock absorbing material to minimize impact damage. In a preferred embodiment this material is wood or rubber but other materials can be used as well. Once the module (5) is stationary the auxiliary trolley (27) can dampen out the remaining movements of the module (5).
Often the modules are lowered to the seabed. Lowering the modules to the seabed requires a power supply or other services from the vessel to function properly. Another module can be lowered on top of the first module already installed on the sea bottom. In order to guide any extra modules, wire guides are used to guide the modules to the correct place without the need for alignment from a ROV. These wire guides run from the module on the sea bottom through the moonpool to the top of the multipurpose tower in this specific embodiment. Up to seven wires and two umbilical wires can be run down at the same time.
When a new module is lowered to the seabed first, the module has to be connected to the guide wires. Sometime the module is of a size that the module cannot move without interference between the wires. In this case, the wires have to be moved apart to create the space needed for passage of the new module. Another problem that occurs is that the movement of the vessel causes the wires to move inside the moonpool of the vessel thus making it difficult to catch and secure the wires. All above mentioned actions and functions have to be incorporated in the moving hatches.
When the multipurpose tower (1) is oriented on the vessel (7) as indicated in
The third rail (351) and the fourth rail (353) can slide over second hatch (21) moved by third rail cylinder (355) and fourth rail cylinder (357). The third rail (351) and fourth rail (353) move in the same direction as the second hatch (21) as indicated by in the figure by the letter “B”. The third rail (351) is shown in a fully retracted position while the fourth rail is shown in a fully extended position.
When the all of the rails are in a fully retracted position, the moonpool (9) is completely cleared. When first rail (345), second rail (347), third rail (351) and fourth rail (353) are fully closed, the longitudinal push-pull unit (19) can move over the moonpool (9) to transport the module (5) to the centerline of the moonpool (9) or to the other side of the moonpool (9).
In
The moving system to move the longitudinal push-pull unit (101) is well known from previous art. Both the longitudinal push-pull unit (101) and the transversal push-pull unit (103) are fitted with locking devices indicated by reference numerals 405 and 407 to prevent the module (5) from moving in unwanted directions. The power to drive the push-pull units in a preferred embodiment is delivered by a central power unit. Each push pull unit can be fitted with an independent power unit as well.
The invention is by no means limited to the exemplary embodiment described herein above, but comprises various modifications hereto, in so far as they fall within the scope of the following claims.
This invention contemplates methods using the module handling package described herein.
The invention contemplates a method for catching and stabilizing sub sea equipment in a moonpool. The method begins by hoisting equipment from the sea bottom into the moonpool and catching the lifting hook using the main trolley located at the bottom of the moonpool. The next steps include further hoisting the equipment into the moonpool together with the main trolley and stabilizing the equipment in one direction by using two movable hatches. The method ends by stabilizing the equipment in a direction perpendicular to the first direction by using an auxiliary trolley with movable arms and lifting the stabilized equipment into the multipurpose tower together with the main trolley and the auxiliary trolley.
The invention contemplates a method for lowering equipment through the moonpool to the sea bottom. The method begins by skidding the equipment on the movable moonpool hatches by using the transversal and longitudinal push pull units and then connecting the lifting wire and the guiding wires to the equipment. The next steps include connecting the auxiliary trolley to the equipment and hoisting the equipment by using the main hoist. Next, the method includes moving the longitudinal push-pull unit and the skid carts out of the way and clearing the moonpool by moving the movable hatches to the sides of the moonpool.
The method for lowering equipment through the moonpool to the sea bottom continues by lowering the equipment together with the auxiliary trolley and main trolley into the moonpool and disconnecting the main trolley and the auxiliary trolley when the equipment has reached the bottom of the moonpool. The method ends by lowering the equipment to the sea bottom, hoisting the auxiliary trolley out of the moonpool, and closing of the movable hatches.
The invention contemplates a method for handling suction piles. The method begins by skidding of the suction pile in horizontal position to the centerline of the moonpool, connecting the suction pile to the main hoist and any umbilical cables, and hoisting the suction pile to a vertical position by the main hoist. The method continues by connecting the auxiliary trolley to the suction pile, moving the longitudinal push-pull unit and the skid carts out of the way, and clearing the moonpool by moving the movable hatches to the sides of the moonpool.
The method for handling suction piles continues by lowering of the suction pile into the moonpool, disconnecting the auxiliary trolley and the main trolley when suction pile reaches the bottom of the moonpool, and lowering the suction pile to the sea bottom. The method ends by hoisting the auxiliary trolley out of the moonpool and closing the movable hatches.
The invention contemplates a method for handling ROV's. The method begins by skidding the ROV with catching basket to the centerline of the moonpool, connecting the ROV to the main hoist and the auxiliary hoist, and hoisting of the ROV. The method continues by moving the longitudinal push-pull unit and the skid carts out of the way, clearing the moonpool by moving the movable hatches to the sides of the moonpool, and lowering the ROV into the moonpool. The method ends by disconnecting the ROV from basket when the ROV reaches the bottom of the moonpool, hoisting the basket, and closing of the movable hatches.
The invention contemplates a method for catching and spreading wires running through the moonpool. The method begins by closing the movable hatches, stabilizing the wires with the movable fenders of the movable hatches in a first direction. The method continues by stabilizing the wires in a second direction perpendicular to a first direction by moving secondary hatches. The method ends by locking the wires in wire spreaders and spreading the wires.
The invention contemplates a method for handling equipment modules on the vessel. The method begins by locking the module to the transversal push-pull unit and moving the module over the transversal rail to the longitudinal rail by the push-pull unit. The method continues by skidding the longitudinal push pull unit, locking of longitudinal push-pull unit to the module, and unlocking of the transversal push-pull unit of the module. The last step of the method entails moving the module by the longitudinal push-pull unit in longitudinal direction of the vessel.
While this invention has been described with emphasis on the preferred embodiments, it should be understood that within the scope of the appended claims the invention might be practiced other than as specifically described herein.
Roodenburg, Joop, Wijning, Diederick Bernardus, Van Kuilenburg, Robert Frodo
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Mar 12 2004 | ROODENBURG, JOOP | ITREC B V | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 015109 | /0109 | |
Mar 12 2004 | VAN KUILENBURG, ROBERT FRODO | ITREC B V | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 015109 | /0109 | |
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